Has your MUCUS plug popped out?
The Big Bang Theory Season 11, Episode 16
"MUCUS plug" again.
The Big Bang Theory Season 11, Episode 16
Oh, I watched a video
of the hagfish producing MUCUS,
The Big Bang Theory Season 9, Episode 9
Boy, if good ideas came out of your brain
the way MUCUS comes out of your nose,
The Big Bang Theory Season 10, Episode 19